Bryum.'] DIPLOPERISTOML 193 



likewise, we have called by the old name of Brywn ; because 

 although the shortness of the teeth in two of the species be very 

 striking, yet in M. dealbata they are nearly equal in length to the 

 inner peristome. The genus Mnium, we think, cannot be separ- 

 ated from Bryum whilst Hypnum undulatum remains with that 

 genus ; whilst Bartramia arcuata, which has a smooth capsule, is 

 retained with the other Bartramice having sulcated capsules ; and 

 whilst similarly anomalous species are suffered to continue in 

 several other genera. 



I. Capsules sulcated. 



1. B. androgynum ; stems nearly simple, leaves lanceolate ser- 



rated their margins recurved, capsules nearly erect cylindri- 

 cal sulcated, lid conical. (TAB. XXVIII.) 



Bryum androgynum. Hedw. Sp. Muse. p. 178. Turn. Muse. ffib. 



p. 113. Hook. Fl. Scot. P. II. p. 149. Moug. et Nestl. n. 620. 



Brid. Meih. Muse. p. 117. Am. Disp. Muse. p. 43. 



Mnium androgymim. Linn. Sp. PL p. 1574. Engl. Bot. t. 1328. 



Smith, Fl. Brit. p. 1344. 



Gymnocephalus androgynus. Schwaegr. Suppl. v. 2. p. 87. Funck, 



Deutschl. Moose, t. 28. / 1 Dill. Muse. t. 31. f. 1. 



HAB. In woods and on banks. 



Stems from one to two inches in length, slightly branched, 

 erect. Leaves erect, appressed or subpatent, lanceolate, acute, 

 serrated, especially towards the extremity, the margins re- 

 curved ; the nerve reaching nearly to the point ; surface papil- 

 lose; colour pale yellow-green, especially when dry. Male 

 flowers, as Hedwig considers them, capitular, terminating an 

 elongated portion of the stem, upon which the leaves gradually 

 become smaller and disappear upwards. Capsule cylindrical, 

 scarcely inclined, sulcated, brown, lid conical. 



Upon examining some continental specimens of this plant, 

 we find that the inner peristome has a pair of ciliae between 

 each of the segments, and that these segments are cleft from the 

 base almost to the extremity. 



2. B. palustre ; stems much branched, leaves lanceolate obtuse 

 entire their margins revolute, capsules ovate oblique sulcated, 

 lid conical. (TAB. XXVIII.) 



N 



